BACTERIA, NOT CLASSIFIED. 72!) 



nent yellowish -white layer. Grows in Parietti's solution, but not in Uffel- 

 mann's gelatin. Forms gas abundantly in gelatin stick cultures. 

 Not pathogenic. 



478. BACILLUS FIGURANS. 



Obtained by Vaughan from water. Crooksbank has described a Bacillus 

 flguraiis which appears to be identical with Bacillus mesentericus vulgatus. 



Morphology. " Bacilli two to three times as long as broad, but showing 

 marked variation in form. Sometimes they appear as very short bacilli, 

 while at other times they grow into long threads." 



Biological Characters. An aerobic, liquefying, sluggishly motile ba- 

 cillus. Spore formation not mentioned. Grows rapidly in the usual cul- 

 ture media at the room temperature feebly at 38 C. " On gelatin plates 

 the deep colonies are spherical and smooth; the superficial growth forms 

 curved and interlacing lines, often presenting most grotesque figures. Plates 

 may show no liquefaction after some days." in gelatin stick cultures does 

 not develop along the line of puncture ; liquefies slowly, and sometimes the 

 fluid is lost by evaporation as fast as it liquefies. After the gelatin has been 

 liquefied half-way down the tube, the bacteria subside to the bottom and fur- 

 ther liquefaction is very slow or does not occur. On agar a thin, white 

 layer is formed upon the surface and a heavy deposit in the water of con- 

 densation. On potato an abundant, faintly yellow, mucilaginous layer. 

 Does not grow either in Parietti's solution or in Uffelmann's gelatin. 



Not pathogenic. 



A 



479. BACILLUS ALBUS ANAEROBIESCENS. 



Obtained by Vaughan from water. 



Morphology. " Bacilli two or three times as long as broad." 



Biological Characters. An aerobic and facultative anaerobic, non- 

 liquefying, non-motile ("only an oscillation ") bacillus. Grows rapidly at 

 the room temperature in the usual culture media also at 38 C. Spore for- 

 mation not mentioned. On gelatin plates forms smooth, spherical, yel- 

 lowish or brownish colonies. In gelatin stick cultures grows both on the 

 surface and along the line of puncture. On agar a thick, milk-white layer 

 is developed. On potato a yellowish-white, glistening growth. Grows 

 both in Parietti's solution and in Uffelmann's gelatin. 



Not pathogenic. 



480. BACILLUS INVISIBILIS. 



Obtained by = Vaughan from water. 



Morphology. Large bacilli with rounded ends, from two to five times as 

 long as broad. 



Biological Characters. An aerobic and facultative anaerobic, non- 

 liquefying, motile bacillus. Spore formation not mentioned. Grows rap- 

 idly in the usual culture media at the room temperature also at 38 C. On 

 gelatin plates pale-yellow, burr-like colonies, with irregular outlines and 

 spreading slightly. In gelatin tubes grows abundantly along the line of 

 puncture and also upon the surface, spreading slowly. On agar a thick, 

 white growth with but little tendency to spread. On potato the growth is 

 invisible. Grows both in Parietti's solution and in Uffelmann's gelatin. 



Not pathogenic. 



481. BACILLUS VENENOSUS. 



Obtained by Vaughan from water. 



Morphology. Bacilli with rounded ends, two to four times as long as 

 broad. 



Biological Characters. An aerobic and facultative anaerobic, non- 

 liquefying, actively motile bacillus. Spore formation not mentioned. Grows 



